I just finished my lt header install 2 days ago. Got my new ovc wires in yesterday and got them on today after work. I started the car just fine and it idled perfectlly. I went to back it out of the garage, pushed the clutch in and then when i gave it just a little bit of gas it backfired. And as i was pulling it up the driveway (to my spot) it backfired the whole way.

I was thinking that maybe i just crossed a plug wire?

Suggestions please


Tim

 

could be lack of backpressure, i have just a borla catback, and mine backfires all the time

 

Did this happen to anybody else when they started their car with open long tubes???

 

Did you unplug your O2's?

It may be that, or you crossed a wire. Car should run fine with open LT's.

I am reading it like it back fires when you press the gas, not let off.

 

Yes my o2's are off. I could not get the one out of the pass side manifold So i ordered new ones and they will be in tomorrow. And it does backfire when i push the gas not let off.


Tim

 

If you have a crossed plug wire, then it wouldn't idle very good at all. But it wouldn't help to re check your wire placement.

I can't say as to your o2's not being connected though. I guess it could cause that, but I don't know, so maybee someone else can help more on this issue.

Z

 

The car will run fine with the O2s disconnected, it will just never jump to closed loop.

 

So its a plug wire?


Tim

 

What else could possibly cause the backfire? I will go back and check the wiring again after work tomorrow but what else should i look for?? Maybe an unconnected sensor? I will also put the new o2's on tomorrow.


Tim

 

I crossed 5 and 7. I was just glad to find the cross on the driver side. Thanks for all the help.


Tim